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  1. Calador

    NFPA 101 - Emergency lighting for designated egress stairs

    Apologies for not stating my question clearly in the first place. let me start fresh. Section 7.8 talks about the illumination of egress routes. It doesn't state whether it is under normal or emergency (mains power failure mode). It goes on to state that stairs need to be illuminated to 108...
  2. Calador

    NFPA 101 - Emergency lighting for designated egress stairs

    Oh yeah, just need to add that I am interested in finding out how to achieve the 108 lux using self contained battery packs not a central battery system.
  3. Calador

    NFPA 101 - Emergency lighting for designated egress stairs

    Hi, What is performance for the emergency lighting in designated egress stairs? Is it 10.8lux or 108lux. 7.8.1.3* The floors and other walking surfaces within an exit and within the portions of the exit access and exit discharge designated in 7.8.1.1 shall be illuminated as follows: a. During...
  4. Calador

    Heat Pumps In general

    As you might have guessed, i didnt take thermodynamics. I may have brushed it a little and thats probably why i vaguely recognise the graph. Thank you for pointing me in the right direction. My initial thought was that the phase change is happening in the compressor itself as in past the...
  5. Calador

    Heat Pumps In general

    that is what i am trying to get my head around. if you were to split the cycle into two parts, the low pressure and the high pressure, like you said, most of the heat comes from the fact that the refrigerant is changing phase and hence the heat generation in the high pressure side. To complete...
  6. Calador

    Heat Pumps In general

    Hi, I am currently researching the feasibility of using a seawater heatpump as it is like a giant replenishable heat reserviour. I have done some digging and there are so many articles out there that suggest that this is the way to go in terms of efficiency. I believe sea water heat pump should...
  7. Calador

    Shading Coefficient VS G-Value

    Hi, I am not really sure whether this is the place to put this query into but here goes anyway. I have a question regarding the difference between the shading coefficient and the G-value of the glass. I have looked into some documents and their interpretations vary quite significantly (in my...
  8. Calador

    Refrigerant Leak Detection

    Thank you. I will give them a ring. Just wanted to know the basic procedure for external application. Doubt any of these will work up in the roof where there are so much air movement. There has to be an alternative if not all those plant rooms that are up in roofs will never have leak...
  9. Calador

    Refrigerant Leak Detection

    I have read the contents of that link but all those methods suggest manual labour. I was looking for an automated system where the detector detects the leak then initiates the pump down mechanism to avoid any more leaking. BMS is then notified for someone to go up there to get it fixed. Only...
  10. Calador

    Refrigerant Leak Detection

    Hi, I am a graduate now going into building services engineering. I am currently looking into leak detection systems for a cooling system connected to an Air Handling Unit (AHU) externally. Basically the AHU is on top of the roof and the condenser has to be external connected to the compartment...

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